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A126517 Number of base 22 n-digit numbers with adjacent digits differing by four or less. 1
1, 22, 178, 1482, 12458, 105294, 892794, 7585162, 64523192, 549288946, 4678354648, 39857857006, 339636526202, 2894437457458, 24668599937974, 210253750878176, 1792068953052004, 15274708515161126, 130195398889209326 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

[Empirical] a(base,n)=a(base-1,n)+9^(n-1) for base>=4n-3; a(base,n)=a(base-1,n)+9^(n-1)-2 when base=4n-4

LINKS

Table of n, a(n) for n=0..18.

PROG

(S/R) stvar $[N]:(0..M-1) init $[]:=0 asgn $[]->{*} kill +[i in 0..N-2](($[i]`-$[i+1]`>4)+($[i+1]`-$[i]`>4))

CROSSREFS

Cf. Base 22 differing by three or less A126490, two or less A126409, one or less A126376.

Sequence in context: A086604 A041932 A125359 * A197496 A107969 A248489

Adjacent sequences:  A126514 A126515 A126516 * A126518 A126519 A126520

KEYWORD

nonn,base

AUTHOR

R. H. Hardin, Dec 28 2006

STATUS

approved

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Last modified October 26 00:52 EDT 2021. Contains 348256 sequences. (Running on oeis4.)